# Triangles: Question Preview (ID: 21241)

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A triangle with two equal sides.
a) equilateral triangle
b) right-angled triangle
c) isosceles triangle
d) obtuse-angled triangle

A triangle with three equal angles.
a) right-angled triangle
b) obtuse-angled triangle
c) scalene triangle
d) equilateral triangle

A triangle with three different sides and one of its angles is 120°.
a) scalene triangle
b) obtuse-angled triangle
c) acute-angled triangle
d) scalene obtuse-angled triangle

The angle facing the shortest length in a triangle is
a) an acute angle
b) the smallest angle
c) a right angle
d) an opposite angle

One of the base angles in an isosceles triangle is 75°, then its exterior angle is
a) 30°
b) 75°
c) 105°
d) 285°

A triangle with 3 equal sides.
a) equilateral triangle
b) isosceles triangle
c) scalene triangle
d) obtuse-angled triangle

A right-angled triangle has 2 equal sides. Both its base angles will be
a) 5°
b) 45°
c) 90°
d) 135°

The vertical angle of an isosceles triangle is 80°. Both its base angles will be
a) 10°
b) 20°
c) 50°
d) 100°

The sum of angles in a triangle is
a) 360°
b) 180°
c) 100°
d) 90°

A triangle with 3 different angles. All the angles are less than 90°.
a) a right-angled triangle
b) an obtuse-angled triangle
c) an equilateral triangle
d) an acute-angled triangle

Can an isosceles triangle be an equilateral triangle?
a) No
b) Yes
c) Sometimes
d) None of the above

Can an equilateral triangle have angles that are less than 60°.
a) Yes
b) No
c) Maybe
d) None of the above

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